1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
NIDA.—These start from highly developed and specialized aquatic branchiferous forms, exhibiting a prosoma with six pedifonn pairs of appendages, an intermediate prae-genital somite, a mesosoma of six somites bearing iamelliform pairs of appendages, and a metasoma of six somites devoid of appendages, and the last provided with a post-anal spine. Median eyes are present, which are monomeniscous, with distinct retinal and corneagenous cell-layers, and placed centrally on the prosoma. Lateral eye* also may be present, …
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- Vol. 2, pp. 301-301